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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c2b9e508c183b17456294dc25a8e87bead5afed497acf1c9a4ef9807388d66' 
  AND token = 'RI1rzQukS+mSmEq63BLLa71HH0RJKZ38+J0jBqOAUdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}